Standing sine wave clock bus for clock distribution systems

Details Standing sine wave clock bus for clock distribution systems Standing sine wave clock bus for clock distribution systems

1993-10-26

1996-05-14

Chin, Stephen

Pulse or digital communications

Synchronizers

327141, 327144, 370 851, 3701001, H04L 700

Patent

active

055175325

ABSTRACT:
A clock phase and frequency distribution system is disclosed which uses a standing sine wave and provides substantially simultaneous significant crossing instances everywhere in the system while using low power and not requiring bus termination or precise control of transmission path characteristics (Z.sub.0). The system is particularly advantageous in high frequency applications such as digital, linear (non-branched), backplane applications, but is also applicable to other topographies such as stars, rings, and meshes. The system includes a sine wave generating and driving circuit, a clock bus, and clock receivers. The clock receivers present a high impedance interface to the clock bus. The basic design considerations and parameters which limit and define performance include the maximum propagation delay between any two points in the system, the total low frequency capacitance of the system, and the Q of the system which must be high at the frequency of the standing wave in order to satisfy low power and simultaneity objectives. To overcome system length limitations, embodiments utilizing master and slaves are provided, where phase feedback is provided to the slaves. Multifrequency systems are also provided.

REFERENCES:
patent: 5060139 (1991-10-01), Theus
patent: 5105340 (1992-04-01), Lawrence
patent: 5157277 (1992-10-01), Tran et al.
patent: 5255375 (1993-10-01), Crook et al.
patent: 5281861 (1994-01-01), Tran et al.
Kihara, "Performance Aspects of Reference Clock Distribution for Evolving Digital Networks", IEEE Comm. Mag. vol. 27, No. 4, Apr. 1989 pp. 24-36.
Hagelauer et al. "Investigations and Measurements of Dynamic Performance of High Speed ADCs", Instrumentation and Measurement Technology Conf. 1992.

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